How To Identify Penetrating Damp
The presence of a damp musty smell. Damage to internal walls (skirting boards) or external (roofing).
Patchy black mould appearing internally on walls.
Watermarks that may appear on the masonry.
Damaged Timber as a result of the wood being saturated by damp (which could have the potential of providing the ideal conditions for a wood rot fungus to germinate).